x^2-12=3

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Solution for x^2-12=3 equation: 


Simplifying
x2 + -12 = 3

Reorder the terms:
-12 + x2 = 3

Solving
-12 + x2 = 3

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '12' to each side of the equation.
-12 + 12 + x2 = 3 + 12

Combine like terms: -12 + 12 = 0
0 + x2 = 3 + 12
x2 = 3 + 12

Combine like terms: 3 + 12 = 15
x2 = 15

Simplifying
x2 = 15

Take the square root of each side:
x = {-3.872983346, 3.872983346}

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